<#

	.PARAMETER DotNET_regPath
		Path in Registy
	
	.PARAMETER DotNET_regKey
		Name of Subkey in Registry
	
	.PARAMETER DotNET_releaseKey
		Release of the installed .NET Framework
		
	.PARAMETER log_File
		Output logged to that filename
		
	.PARAMETER Line_Break
		Breaks long lines in output
		
	.EXAMPLE
		Format:
		
		"528049" = ".NET Framework v4.8" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including other Windows 10 operating systems): 528049"
		"533325" = ".NET Framework v4.8.1" +$Line_Break+ "All other Windows operating systems: 533325"
	
		
	.LINK
		https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-determine-which-versions-are-installed

#>

# Path and Subkey in Registry
$DotNET_regPath = "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
$DotNET_regKey = "Release"

# .NET Framework version from Registry
$DotNET_releaseKey = (Get-ItemProperty $DotNET_regPath -Name $DotNET_regKey).$DotNET_regKey

# Log all information into that file
$log_File = "C:\Temp\Get-.NET_Framework_Version"

# Carriage Return
$Line_Break = "`r`n"

# valid .NET Framework releases
$DotNET_Frameworks = @{

	"378389" = ".NET Framework v4.5" +$Line_Break+ "All Windows operating systems: 378389"
	"378675" = ".NET Framework v4.5.1" +$Line_Break+ "On Windows 8.1 and Windows Server 2012 R2: 378675"
	"378758" = ".NET Framework v4.5.1" +$Line_Break+ "On all other Windows operating systems: 378758"
	"379893" = ".NET Framework v4.5.2" +$Line_Break+ "All Windows operating systems: 379893"
	"393295" = ".NET Framework v4.6" +$Line_Break+ "On Windows 10: 393295"
	"393297" = ".NET Framework v4.6" +$Line_Break+ "On all other Windows operating systems: 393297"
	"394254" = ".NET Framework v4.6.1" +$Line_Break+ "On Windows 10 November Update systems: 394254"
	"394271" = ".NET Framework v4.6.1" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including Windows 10): 394271"
	"394802" = ".NET Framework v4.6.2" +$Line_Break+ "On Windows 10 Anniversary Update and Windows Server 2016: 394802"
	"394806" = ".NET Framework v4.6.2" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including other Windows 10 operating systems): 394806"
	"460798" = ".NET Framework v4.7" +$Line_Break+ "On Windows 10 Creators Update: 460798"
	"460805" = ".NET Framework v4.7" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including other Windows 10 operating systems): 460805"
	"461308" = ".NET Framework v4.7.1" +$Line_Break+ "On Windows 10 Fall Creators Update" +$Line_Break+ "and Windows Server, version 1709: 461308"
	"461310" = ".NET Framework v4.7.1" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including other Windows 10 operating systems): 461310"
	"461808" = ".NET Framework v4.7.2" +$Line_Break+ "On Windows 10 April 2018 Update" +$Line_Break+ "and Windows Server, version 1803: 461808"
	"461814" = ".NET Framework v4.7.2" +$Line_Break+ "On all Windows operating systems" +$Line_Break+ "other than Windows 10 April 2018 Update" +$Line_Break+ "and Windows Server, version 1803: 461814"
	"528040" = ".NET Framework v4.8" +$Line_Break+ "On Windows 10 May 2019 Update" +$Line_Break+ "and Windows 10 November 2019 Update: 528040"
	"528372" = ".NET Framework v4.8" +$Line_Break+ "On Windows 10 May 2020 Update," +$Line_Break+ "October 2020 Update, May 2021 Update," +$Line_Break+ "November 2021 Update, and 2022 Update: 528372"
	"528449" = ".NET Framework v4.8" +$Line_Break+ "On Windows 11 and Windows Server 2022: 528449"
	"528049" = ".NET Framework v4.8" +$Line_Break+ "On all other Windows operating systems" +$Line_Break+ "(including other Windows 10 operating systems): 528049"
	"533320" = ".NET Framework v4.8.1" +$Line_Break+ "On Windows 11 2022 Update: 533320"
	"533325" = ".NET Framework v4.8.1" +$Line_Break+ "All other Windows operating systems: 533325"

}

# Function to generate Message in Log
function log_Output {

	Param (
		
		$output
	
	)

	# Current date
	$date = (Get-Date -format "yyyy-MM-dd_HH-mm-ss")
	$ldate = (Get-Date -format "yyyy-MM-dd_HH-mm")

	# Skript Log
	$log_File = "{0}-{1}.log" -f $log_File, $ldate
	
    # Format a log message
	$message = "{0}: {1}" -f $date, $($output)
	$message = $message | Out-File $log_File -Append
			
}

# Only execute if Release is valid
if ($DotNET_releaseKey) {
	
	# Iterate through list
	foreach ($DotNET_Key in $DotNET_Frameworks.Keys) {

		# Compare key with list of releases
        if ($DotNET_Key -eq $DotNET_releaseKey) {
			
			# Build a message string
            $message = "{0}" -f $DotNET_Frameworks[$DotNET_Key]
			
			# Log message to Stdout
			Write-Output $message

			# Log message to a protocol
			log_Output $message			

			exit 0
        
        }

    }
	
    # Build a message string
	$message = "Unable to detect a valid .NET Framework Version."

	# Log message to Stdout
	Write-Output $message

	# Log message to a protocol
	log_Output $message	
	
}
    
exit 0